Green Municipal Aggregation

What Is GMA?

Massachusetts and Rhode Island state laws allow a city or town to choose the electricity supplier for residents and businesses within that municipality. This is called municipal aggregation or community choice aggregation. It allows for important energy decisions to be made at the local level rather than by an investor-owned utility or by a for-profit competitive electricity supplier. 

Green Municipal Aggregation, or GMA, is a model we devised with energy broker Good Energy that adds more Class I or "new" renewable energy to residents' electricity at a competitive price. When a community decides to enact GMA, it goes out to bid for an electricity supplier and secures a long-term price and a cleaner electricity supply. That supplier replaces the utility's Basic Service, offers a more stable price (usually cheaper in the long run, too), and adds more renewable energy than required by state law.

Participating Communities

Here is a list of participating communities:

NameRenewable electricity (added by default)Supplier (what you'll see on your electric bill)Website
Andover, MA15%Dynegyacp.andoverma.gov
Arlington, MA30%NextEraarlingtoncca.com
Barrington, RI5%NextErabarringtoncommunityelectricity.com
Bedford, MA20%NextErabedfordcca.com
Belchertown, MA10%Dynegybelchertownenergychoice.com
Boxford, MA10%Dynegyboxfordelectricity.com
Brookline, MA36-45%NextErabrooklinegreen.com
Central Falls, RI5%NextEracentralfallscommunityelectricity.com
Cohasset, MA10%Direct Energyelectricity.cohassetma.org
Dedham, MA10%Constellation New Energymasscea.com/dedham
Fairhaven, MA10%Constellation New Energymasscea.com/fairhaven
Gloucester, MA10%Constellation New Energygloucester-cea.com
Hamilton, MA5%Dynegyhamiltoncca.com
Hanson, MA10%Direct Energy Serviceshansoncommunitypower.com
Malden, MA10%Dynegymaldencommunityelectricity.com
Marshfield, MA10%Direct Energymarshfield-ma.gov
Medfield, MA10%Direct Energy Serviceselectricity.medfield.net
Medford, MA5%NextEramedfordcea.com
Melrose, MA10%NextEramcp.cityofmelrose.org
Millis, MA5%Constellation New Energyhttps://empower.millisma.gov/
Milton, MA10%NextEramiltoncea.com
Narragansett, RI5%NextEranarragansettcommunitychoiceelectricity.com
Newport, RI5%NextEranewportcommunityelectricity.com
Portsmouth, RI5%NextEraelectricity.portsmouthri.com
Providence, RI5%NextEraelectricity.providenceri.gov
Quincy, MA10%Dynegyquincycea.com
Rockland, MA10%Dynegyrockland-cea.com
Scituate, MA10%Direct Energyelectricity.scituatema.gov
Somerville, MA20%Direct Energysomervillecce.com
South Kingstown, RI5%NextEraelectricity.southkingstownri.com
Stoneham, MA5%Dynegystonehamcea.com
Waltham, MA10%Dynegywaltham-cea.com
Westford, MA10%Constellation New Energymasscea.com/westford
Westwood, MA10%Direct Energytownhall.westwood.ma.us
Winchester, MA20%NextErawinpowerma.com

Green Municipal Aggregation map 2023

Get involved

If you’re interested in learning more about GMA or want to find out how your community can get started, contact Mikaela@greenenergyconsumers.org